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System is Not Using the Maximum Available Physical Memory in RHEL4.5

hello
I got some error messages on of our storage node server from last one month and due to this the backup process are getting halted so many time. I suspect that may be due to high utilization of memory. But the server having 8GB of physical memory along with 8GB of swap memory. When I checked the memory utilization statistic I found that every time it is using 2GB only out of the total memory.

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I feel that there is not enough information here to make a value judgement. What application are you using for backup?
What is the backup destination?
What other processes running?
How busy is the network?
Are there any errors in the backup log?
How many and what size buffers are created?
What other tools are you using to detect the problem?
and the list goes on.
Regards,

From what I get from your dmesg output your 'nsr' Networker processes are
being killed during startup. Your environmental variables for semiphores
and segmem are not set up properly. I would start with that-

4. Network Speed 1GBPS and utilization - 1.2%
5. If backup failed then we got error as networker service in in halted state on this server.
6. Buffer - normal
7. HP OVO (perf tool) for monitoring and alert management.
for error detection no such tool we are using. Only analysis syslog manually.

I cannot answer your question about semaphores and segments without knowing a lot more about your environment as there is no standard solution. Each application has its own requirement and these are cumulative. The problem does appear to be network related and this could be a whole host of things. A simple way of troubleshooting this could be to stop all processes with the exception of the backup and observe where the backup fails, what server, what disk, what part of the network, etc.
I would be more helpful with the OV stuff but it has been a number of years since I was involved in the solution design and configuration of OpenView, sorry.
You need to logically find out why the network services are dying.

The EMC Networker install guide is a good place to start, the system admin
manual, and the trouble shooting guide. Try google, then if you cannot find
it in those places you should have a service contract, or at least
installation help. This is an application specific issue. The settings are
different for each purpose of the machine.

Oh yeah you need to have an EMC login that was allotted to you look on the
EMC website. There is a plethora of documents, manuals, white papers, and
forums available to you there.

By the way RHEL 4.5 itself is END-OF-LIFE version
RedHat will provide extended support another 2-3 years for a premium price
it is time to move OS up to at least version 5 (I run Symantec NetBackup 7 on that just fine)